n.冲动；激励；原动力
I felt the impulsion to ask her to stay. 我心里有股冲动
Faith is the impulsion, the propulsion of this power within. 信念是一种激励，是对你内心巨大能量的一种激励。
Interaction of parts is the impulsion to keep flourish of the Earth. 零件与零件之间的互动，就是维持这个地球生机盎然的原动力。
